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4. Perform utility research; request record information to determine what other utilities <br />are in the area. <br />5. Evaluate findings from the information accumulated to see if it indicates a corrosion <br />source and determine next steps. <br />Phase 3 - External Corrosion, Site Investigation <br />6. Field presence during Geotechnical investigation for Four Point Test Method to <br />evaluate transient voltages, and sampling of soil for corrosivity, pH, and other <br />characteristics. <br />7. Field presence during soft digs to evaluate pipe at locations selected jointly with <br />IRCDUS staff to visually inspect the exterior condition of the pipe in identified repair <br />locations and other locations as determined during field investigation and soils <br />testing. <br />8. We will perform independent field investigations with IRCDUS staff to review items <br />such as continuity testing. <br />9. We will review local utilities such as underground gas to determine if cathodic <br />protection or nearby infrastructure is present. <br />Phase 4 - External Corrosion, Potential Sources / Causes <br />10. Prepare a list of about 20 potential areas of concern and sources which have <br />potential to contribute to pitting or corrosion. The list will expand or collapse based <br />on our findings. Each potential source / cause will be identified, explained as a <br />potential contributor and then be ruled out or assigned to the next level of <br />investigation. <br />Phase 5 — Workshop / Summary Memorandum <br />11. Conduct an informal workshop with IRCDUS engineering and operations staff to <br />review the questions associated with the multiple parameters analyzed, and <br />potential findings. This workshop is intended to review investigated parameters <br />and the questions raised to narrow down the list of potential questions that arise <br />from our research. <br />12. Prepare an engineering memorandum of the findings of the investigation and <br />evaluations and provide recommendations, if warranted, to mitigate any Corrosion <br />issues identified. We will tabulate the issues evaluated and findings and based on <br />the conclusions formed we will provide recommended mitigation measures. <br />123 <br />